Windows XP forum: Computer Shuts Off During Boot-up

This just started today. When I turn on my computer, before the boot sequence starts, the computer completely shuts off. After 2 or 3 tries later it will boot into the BIOS with the following screen / message:

On the left side of the screen the hi-lited line says:

FBS: SDRAM: PCI Freq. Ratio [66:100:33]

On the right side of the screen the help message says:

During last boot-up, your system hung for improper FSB/SDRAM/PCI frequency ratio and/or CPU external frequency. Your system is now working in safe mode. To optimize the system performance and reliability, make sure the frequency combination conforms to the specifications of your CPU, SDRAM and other connected devices.

When I hit "escape" and "save and exit" it boots up into windows and all appears ok until the next boot-up.

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